My truck was always at that level, it did bother me but I chalked it up to the gauge. I do think one of the sensors that @Spike Strip added either here or somewhere else is a worthwhile purchase for simple peace of mind.
That would normally sit on top of one venturi. It’s like a little donut gasket. I see two below the lower Venturi... was the one in the bowl a 3rd or one of those two?